Scale.



G. H. HAPGOOD.

SCALE.

APPLICATION FILED JAN. 14. 1905.

C. H. HAPGOUD.

SCALE.

APPLIUATIDN FILED JAN.14,1905.

Patented Nov. 3, 1908 2 SHEETS-sum1' 6% mw. be n -To all whom it mag concern:

'UNITED sTA'rns PATENT onirica.

CLARENCE H. HAPGOOD, OF DAYTON, OHIO, ASSIGNOR TO lOLEDO COMPUTING SCALE COMPANY, OF NEWARK, NEW JERSEY, A CORPORATION OF NEW JERSEY. n

SCALE.

Bpecication o! Letters Patent.

Patented Nov. 3, 1908.

Application tiled January 14, 1905. Serial No. 211,180.

Be it known t at I, CLAnnNoE HAP- GooD, a citizen of the United States, residin at Dayton, in the county of Montgomery an State of Ohio, have invented certain new and useful Improvements in Scales, of which the following is a specification.

M invention relates to scales, and more particularl to means for neutralizing or compensating for variations in temperature,

y to the end that the scale ma indicate, With absolute accuracy under a conditions of temperature, the weight or price, or both, of an article, according to the particular character of scale in which my invention may be embodied. y

Speaking in general terms m invention com rises a thermostat associate with novel mec anism arran ed to affect or vary the relative distance etween the pivots of the counterbalancing mechanism and the scale beam, or between the pivots of such beam and the platform or other support for the article to be weighed, to which end I make one of the pivots movable and connect it operatively With a thermostatic device with the result that the contraction and expansion and also the varyin tension of the counterbalancing springs ue to differences in temperature are compensated for and the well known errors in spring scales due to changes in temperature are avoided.

The ob'ect of my invention is to provide novel an ing the effect of the differences in temperature and compensating therefor, and articularly to provide a construction inw ich the movable or 'adjustable ivot, Whichever it ma be, shall be at all times under the contro of the thermostat and be incapable of movement except through the medium of the thermostat. In other Words, the movements of the thermostat are freely transmitted to the movable pivot, but no strain or movement can'be transmitted from the pivot te the thermostat, with the result that the pi ot of itself is locked and can be moved soly by the thermostat. In the present instance these results are brought about h the interposition between the pivot and t e thermostat of mechanism ca able of actuation only the thermostat an u der the control of it a one and serving to loc the tpivot against any movement or strain applic to the pivot eflicient mechanism for overcom-4 direct and not through the medium of the thermostat. p

In the drawings, Figure 1 is an elevation of a scale embodying my invention; Fig. 2 a sectional plan view on the line 2-'-2 of Fig. 1; Fig. 3 a sectional elevation on the irregular line 3 3 of Fig. 2; and Fig. 4 a section on the line 4-4 of Fig. 3.

In the drawings I have illustrated one embodiment of my invention in which I have, for the sake of a clear and definite description but without intention of limitation thereto, chosen to show a scale employin a platform and indicatin mechanism of the drum or barrel type an counterbalancing mechanism of the spring t pe, which constructions are Well known an need no detailed description. Describing, so far as willbe necessary, the' articular form of scale illustrated in the rawin sZ the su por or the article to be weighe is, in this irstance, the platform 1, which is ivoted on the pivots 2 projecting laterali fiom o plosite sides and intermediate thelen th o t e scale beam 3. Y

The sca e beam is itself provided in the presenti-'instance With the air of pivots 4A near one end and beaiing in t e upper ends of the standards or supports 5, rising from the base 6 of the scale.

The right hand end (Fig. 1) of the scale beam carries a pivot 7, to which the counterbalancing mechanism, comprising more particularly the usual spiral s rings, is connected.

the counter alancing springs are connectedl with the scale beam, or rather with itspivot 7, by means of the vertical operating rod 10. In the present embodiment of my invention the pivot 7 is the'movable or adjustable one, responding to the effect of the thermostat hereinafter described, whereby the dier- ,ences in temperature are compensated for; whereas the ivots 2 and 4 have a ixed relation or position, it being understood tliat a shifting of the movable pivot and the change in their 'particular relative positions result m chan esin degree ofthe effect upon the counterba ancing or 'indicating mechanism and thereby obtain accuracy in weighing or computation or both.

ibeam adacent the post or supper-tv@ has a As shown, this counterba ancing, and the in- As herein shown. the inner end of Athe seele Ion ritudinal slot l1, Whose longitudinal paralle sides constitute guides or slides for the movable block 12 carrying the pivot 7. The upper guide 13 is formed as a cross piece, as seen particularly in Fig. 2,while the ower uide is substantially a longitudinal rib pro- ]ecting u wardly from the body of the scale beam. "he guide block has on its under edge or side a guide way formed by the depending langes 15 embracing the guide 1i, while in sockets at the two upper corners of the block are arranged balls 16, received by a longitudinal groove 17 in the lower edge or side of the upper guide 13, whereby a ball bearing is provided.

The os1tion of the block 12 is controlled b r a tiermostat in such manner that the block is moved longitudinall of the scale beam certain distanf. x by tlie thermostat according to "Le tem erature, with the result that accurate in ication is maintained by the scale regardless of changes in the temperature. As shown, the thermostat 18 is U-shaped, with one leg or end thereof secured or anchored in fixed position to the cross-piece 19 of the scale beam by means of screws 20 or otherwise. The thermostat may be of any suitable construction, being composed as usual of strips of material possessin different coeiiicients of expansion, with t e result that the free end 18 thereofl will have a movement toward and away from the anchored end according t the changes in temperature.

Accordin to my invention the' thermostat is not irectly attached to or connected with the movable block and its' ivot, but indirectl connected therewith' of nove mechanism hereinafter Y escribed which serves the iur iose of transmitting to the movable bloc al the movements of the thermostat due to chan es-in tem erature, but at the same time loc s the bloc against all strain or positive force applied directly to such block. Consequently all the movements of the block are absolutely under the control of the thermostat and the strains or force referred to cannot be transmitted to the thermostat in any manner whatsoever.

The mechanism above referred to as interposed between the thermostat and the movable block consists in the present instance of the following parts: A lever 21 is ivoted bymeans ofa stud 22 on the cross liar 19 and operatively connected with the free end 18EL of the thermostat b a link 23. For adjustin purposes, the enr or arm of this lever 21 gback of the pivotal point may have an additional hole or holes, such as the hole 24, to receive the pivot pin 25 at the in- "ner end of the link 23. The other arm of this lever carries a curved rack or segmental gear 26, which is arranged to-mesh with a pinion 27 adapted to partially rotate or rock a. substantially semi-circular cam disk or so that in either event the disk shall move with the pinion; in other words7 the lever 21 is operatively connected with the cam disk by means of a rack and pinion connection. The disk is provided with a substantially semi-circular cam slot 31, which is eccentric to the axis of rotation or movement thereof and is ada )lcd to receive a pin 32 carried at one end oi a link or operating bar 33 extending longitudinally of the forward end of the scale beam, as clearly illustrated in Figs. 2 and 3. This bar, which is connected at its outer end with the movable block by means of the screw 34, is maintained in proper position laterally with relation to the scale beam and thereby guided in its longitudinal movements by a stud or pin 35 rising from the web 30 at the scale cam and cooperating with a longitudinal slot 36 in the bar.

From the foregoing description it will be understood that all movements of the free end of the thermostat are communicated to the lever 21 through the link 23 and from such lever to the movable block through the medium of the cam disk and the longitudinal 9 link or bar 33. As the lever 21 is rocked in one direction or the other, the cam disk is likewise rocked, with the result that the link 33 is moved to the ri ht or left (Fig. 2) according to the particu ar direction of movenient or oscillation of the disk, as determined by the direction of movement of the freel end of the thermostat. This longitudinal movement of the link 33 is of course communicated to the movable block 12 and the pivot 7 thereby drawn closer to or moved further awa f from the other pivots 2 and 4, with the resu t that the scale will indicate accurately notwithstanding the contraction and expansion of the springs and the varying tension thereof due to changes in tcinperature, whieli are thus compensatedrl'or by the action ol' the thermostat in changing or adjusting lha relative distance between the pivots. Moreover, while the block l2 is free to be moved through the .medium ol' the mechanism intex osed between it and the thermostan it is loc ed against all movement throughpositive force or strain applied to it directly, inasmuch as such interposed mechanism is so z constructed that force cannot be transmitted from the block to the thermostat., wththe result that the thermostat is absolutely isolated and relieved from all strain that Imy come upon the movable block.

1. In a scale, the combination olI a support. for the article to be weighed, countclrbalancing mechanism, a pivoted scale beam operatively connected with the support. and counl terbalancing mechanism, a movable ivot for parying the effective leverage of t e scale p u a thermostat, and mechanism arged Y intermediate the thermostat yandl thiriovahle pivot and transmitting to such pivot the` movements or variations of the thermostat with movement of the t ermostat by the pivot.

3. In a scale, the combination of a su port for the article tov be weighed, counterba ancing mechanism, a pivoted scale beam .operatively connected With the support and provided -'th.a movable pivot operatively con-- nected with the counterbalancing mechanism, a l thermostat mounted-on the scale beam, and operating connectionV between the thermostat and the movable pivot to adjuist the latterftoxcompensate for changes in temperature and controllecL as to length by the thermostat. v

4. In a ale, the lcombination of a su port dior the article tobe weighed, counterba anctivel connected v vide mths movable ivot operatively cona i ""thermostat and muvblpivot for transmit` ing mechanism, a pivoted scale, beam operawith the support and pron'eeted the coun rbalancingmechanism, a thermostat monntedon the scale beam, 'ndfan operating connection between the v ting the movementsof the former to the latter including locking means to prevent movement of the thermllstat by the pivot.

5. In a scale, thecombmation of a su port for the, article to be weighed, counterba ancing mechanism, apivotedscale beam opera-` tively connected with the support and counterbalancing mechanism,` a movable pivot for varying' the ,effective leverage of the scale beam, a thermostat and mechanism arranged intermediate the t ermostat and the movable pivot and' transmitting to such pivot the *with the thermostat and movements Qrvariations of the 'thermostat and comprising alcam device' mounted on the scale cam with connections` respectively ivot. rB n `a scale, the comit; port ,A for the article lto be weighed, counteralancing mechanism, a pivcted scale beam operativel connected with the support and eounterba.ancingqmechanism, a movable pivot'fcr varyingtheeffective leverage of t the scale beam, athermostat, and mechanism arrangegintermediate the thermostat l provisions for preventlg` such and the movable pivotand transmitting to such pivot the movements or variations of the thermostat and comprisin a disk mounted to rock on the lscale ,provided with a cam slot, a connection between the thermostat and disk for rocking the latter according to variations in temperature, iand a connection cooperating with the cam slot and movable pivot for operating he latter.`

ort for the article to be weighed, counteream and a scale, the combination cfa sup-l alancing mechanism, Aa pivoted scale beam operativel iconnected with-the support and counterba ancing mechanislm` a movable `pivot for varying the effective leverage of.

lthe scale beam, a thermostat, and mechanism arranged intermediate the thermostat alnd the movable pivot and transmlttlng to the t ermostat` and comprising a cam vice*` mounted -to rock on ,tlie scale beam, va lever `pivoted on the'beani and o cratively connected at one end with the t ermostat .and atvthe other with'the cam device, and a ivt the movements or variations of connection between such cam device 'and the movable p'lvot. 1

8.,In a scale, the combination of a support for the article to be weighed, counteralancing mechanism, a pivoted scale beam operativel connected with the support and counterba ancing mechanism, a movable 'pivot for ,varying the effective leverage of the scale beam, a thermostat, and mechanism arranged intermediate the thermostatV and the movable pivot and transmitting to such pivot the movements or variations of the thermostat and com risinga cam device nrounted to rock on t e sc f beam, a lever pivoted on the beam andltw eratively connected with the cam device, a link connectionA between-` the thermostat and the lever, and an operating connection between the cam device and the movable pivot.

9, In a scale, the combination of a suport for the article to be weighed, counterfalancing mechanism, appivoted scale beam.

operativel connected with the support and counterba ancing mechanism, a 'movable pivot `for varying the eil'fective leverage of the scale beam, a thermostat, and mechanism arranged intermediate the thermostat and the movable pivot and transmitting to such pivot themovements or variations of the thermostat and comprising a carndevicev mountedl to rock on the scale beam, a pinion connected with such cam device; aslever pivoted von the beam and `atene' end operjatively connected lwith the thermostat and at 4its other end carryin a segmental gear 1254 in the pinion, an an operating connec n etween the camdevice andmovl ivot. .1 In escale,

"the combination of a supfor the articletofbayrgigbed, counter-` 130 balancing mechanism, a pivoted scale beam operatively connected with the support and coiiiitcrlmlaiiciiig mechanism, a movable pivot for varying the ell'ective leverage of thc scale beam, a thermostat, and mechanism arranged intermediate the thermostat and the movable pivot and transmitting to such pivot the movements or variations of the thermostat. and comprising a cani disk mounted to rock on the scale beani and provided with a slot eccentric to its axis of movement, an o eratinl"bonnection between the cani dis and t ie thermostat, and a link or bar connected at one end with the movable pivotand carrying at its other end a pin engaging the slot of the cani disk.

In a scale, the combination of a support for the article to be weighed, counterbalancing mechanism, a pivoted scale beam operativel connected with the support and countcrba ancing iiiecl'ianisiii, a movable pivot for varying'thc e'ective leverage of the scale beam, a thermostat, and mechaiiism arranged intermediate the thermostat and the movable pivot and transmitting to such pivot the movements or variations of the thermostat and comprising a cam disk mounted to rock on the scale beam and provided with a curved slot eccentric to its axis of movement., an operatin `connection between the cam disk and t e thermostat, a link or bar slotted intermediate its length and connected at one end with the movable pivot and carrying at' its other end a pin ciigaging said cam slot, and a pin o1' stud mount ed on the scale beam and engaging the slot of the link. Y

12. ln a scale, the combination of a support foi the article t'o be weighed, counterbalancing mechanism, a pivoted scale. beam operatively connected with the support and couiiterbalancing mechanism, a` movable .pivot for varying the effective. leveragg` oi' thc scale beaiin'la thermostat, and mechanism arranged intermediate the thermostat and the movable pivot and transmittingr to such pivot the movcmeiits'or variations of the thermostat and comprising a cam-disk mounted Ato rock on the scale beam and providedjwith a slot eccentric to its axis of movement, a rack andgpnion connection between the thermostat and. disk, and a link or bar at oiic end connected with thc movable pivot and at the other end carrying a pin engaging said slot 13. lii a scale, the combination ol a support for the article to be weighed, .counteralancing mechanism, a pivotcd scale beam operatively connected with the support and counterbalancingl mechanism, a movable pivot for varying thc cll'ectivc leverage' ot the. scale bean-i, a -tlii-iiiioslni, and nicchaiiislnV arranged ilitcriiieibate the lheriiiostat shaped, said beam having. a

eoaoss and thel movable pivot and transmitting to such pivot the movements or variations of the thermostat and comprising a cam disk mounted to rock oii the scale beam and provided with a slot eccentric to its axis of movement, a lever pivoted on the beam and at one end connected with the thermostat and att Athe other end carrying a se ntal gear, a pinion connected with the ciln and engaged by the gear, and a link or bar at one end connected with' the movable pivot and alt the other end carrying a pin engaging said s ot.

14. In a scale, the combination of a support for the article to be weighed, counterialancing mechanism, a pivoted scale beam operative! connected with the support and counterbahmcing mechanism, a movable pivot for varying the effective leverage of the scale beam, a thermostat, and mechanism' arranged intermediate the thermostat and the movable pivot and transmitting to siich pivot the movements or Avariations, of the thermostat and com rising a cam device mounted to rock on t e beam, operative connections between the thermostat and also the a cross bar on the scale beam to which one end ol` the thermostat is secured.

' 15. In a scale, the combination of a support t'oi the article to be weighed, 'counterialanciiig mechanism, a pivcted scale beam' operatively connected with. the support and counterbalancing nieQhansm, a movable pivot for varying the effective leverage of the scale beam, a thermostat which is U- movable pivot, and4 shaped with one end connected with the sca e beam, a cam device mounted on the beaiii and operatinfir connections between the cam device` and mostet and the movable pivot. l

16. l ii a scale, the combination of a support lfor the article to be weighed, counteralancing inechanisiiiha pivoted scale beam opgigatively connected withl the support and cmiiiterbalancing mechanism, a movable pivot for varying the effective leverage of the scale beam, a tlierinostat which is U- cross bar to which one end of the thermostat is c011- iiccted.,la lever pivoted on the cross bar and operatively connected with the free or movablifend o the thermostat, a cam device' iii'onnted to rock on the' beam and having operative connection with the lever, link 'or har connecting the cani-device and movable pivot. l

17. In a scale, lthe'combination. of counterbalancing mechanism, a pivoted scale beam havingiatone. end a longitudinal slotV formed betwecirparallel guides, the upper guidi` having a longitudinal oove on its inner edge or side, a block aving on its and av cam device and the t 1e free end of the thellower edge a uideway to receive the lower ating connection between the block and guide of tle allrli, and hafing sozketsl;i on thermostat. lts u per er ge, a s arrange msm soc ets n andgngaging said groove, said block can' CLARENCE H' HAPGOOD 5 ing a. pivot operatively connected with t e Witnesses: V

counterbalancmg mechanism, s, thermostat ALLEN DE VILLBIss, Jr.,

Y mounted on the scale beam, and an oper- L. B. MOILHENNY. 

